Diagram showing the method of using the eclipses of Jupiter's satellites to measure the velocity of light. The first person to use this method was Ole Rømer. Ole Rømer (1644-1710) a Danish astronomer who in 1676 made the first quantitative measurements of the speed of light. Dated 19th century

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Keywords: 17th, 1873, 19th, archival, archive, astronomer, astronomy, century, christensen, danish, diagram, eclipses, historical, history, illustrated, illustration, jupiter, light, measure, measurement, measurements, method, ole, satellites, science, space, speed, velocity, ømer